Love and pursuit of wisdom by intellectual means and moral self discipline. A system of thought based on investigation into theoretical or conceptual underpinnings for a deeper understanding. It comprises logic, ethics, aesthetics, metaphysics, and epistemology. Advaita ushered a new era in Indian philosophy between 5th and 9th century BC with myriad schools of thought such as Visishtadvaita (qualified monism), Dvaita (dualism), Dvaitadvaita (dualism-nondualism), Suddhadvaita (pure non-dualism), Achintya Bheda Abheda and Pratyabhijña (the recognitive school).